Drilling-machine



'2 Sheets-Sheet 1.

(No Model.)

BIL. MANSFIELD.

DRILLING MACHINE.

L'eZcZ n 00 wa M 8 w W 2 i n L M p e E3 S d .w n 6 b a N. PETERS.Pholo-Lilhcflrapher, wnshingmn, D. c.

2 Sheets-Sheet 2.

(Nb Model.)

ELL. MANSFIELD. DRILLING MACHINE;

Patented Sept. 28,1886.

M M w 2 W W W Z W N. PETERS, Plv J-Lilhogrmpher, Walhiuginri, D c

UNITED STATES PATENT OFFICE.

EDWIN LASELIJE MANSFIELD, OF BOSTON, MASSACHUSETTS.

DRILLING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 349,728, datedSeptember28, 1886.

Application filed July 8,1886. :Serial No.207,435. (No modl 1.)

To all whom it may concern:

Be it known that I, EDWIN LASELLE MANS- FIELD, of Boston, in the countyof Sufiolk, of the Commonwealth of Massachusetts, have invented a newand useful Improvement in Boring-Machines; and I do herebydeclarethesame to be described in the following specification andrepresented in the accompanying drawings, of which Figure 1 is a topview, Fig. 2 a side elevation, Fig. 3 a front end view, and Fig. 4 is alongitudinal and median section, of a machine embodying my invention,the nature of which is defined in the claims hereinafter presented. Fig.5 is a top view, and Fig. 6 a front elevation, of the toothed rails Gand H, hereinafter explained. Fig. 7 is a side view of the impeller P ofthe pattern-bar. Fig. 8 is a front view of the bar 9, with its series ofstuds.

This machine is to bore, simultaneously, a series of bars alike in form,and each either straight or curved, in correspondence with a pattern-barhaving in it a series of holes, such bars being used in the manufactureof upright piano-fortes.

In the Said drawings, A denotes the frame for either directly orindirectly supporting the main operative parts of the machine, suchframe having in its lower portion a horizontal platform, a, on andextending above which are two parallel rails, 19 1), upon which thegrooved wheels 0 of a fiat carriage, B, rest and run, such rails beingarranged longitudinally in the frame. The carriage -B is furnished witha pair of rails, d d, that extend across it transversely, and supportthe wheels 0 of a second or work-supporting carriage, D, provided at itsfront and rear ends with flat rails f 9, extending up from it, and beingto support the pattern-bar E and a series of bars, F, of like shape tobe bored. There is hinged to the back rail, g, which has a series ofstuds or points, z, projecting upwardly from it, a bar, h, which, whenturned downward over and upon thepattern-bar and the bars to be bored,serves to hold them upon and keep them properly apart on the studs andthe two rails f and g, the studs 2' at the time entering holes orrecesses at or next the rear ends of such bars.

Between the bearing-rails f and g, and extending across thework-supporting carriage D, is a stationary toothed rail, G, and a mov-,able toothed rail, H. 'Each of the said rails has jaws or teeth k,projecting up from it, each of the teeth of each bar being projectedsomewhat into the space between two next adjacent teeth of the fellowbar. The pattern-bar, as well as the bars to be bored, extend betweenthe teeth of the two rails G and H, and are clamped or held by them bymoving the movable rail sufliciently forward. Such movable rail ispivoted to the lower arm of a lever, L,

which at its foot is fulcrumed in and to a projection, m, from the frameA. Inthe upper part of the lever L there is an angular slot, a, in whichis placed a roller, 0, pivoted within a furcated arm, p, extending fromthe bor ngtools spindle-carriage M. The said carriage M is adapted toplay or. move vertically within the frame A. It has within it and supports a series of,boring-tool arborsor spindles,

r, provided with pulleys s, to receive endless beltsextending from alike number of pulleys, t, fixed on a driving-shaft, u,-arranged asrepresented 'Each of the said spindles is to be provided withaboring-tool,o,'extending down from it. Besides the said spindles, thereis within the carriage M a comically-pointed plunger w, thatslidesfreely vertically within the carriage, and is placed directly overand to engage with the pattern-bar by the conical foot of the plungerentering a hole in said bar. A shoulder, or, on the plunger, by restingon the base y of the carriage M,determines the distance to which theplunger can move downward in the carriage. A spiral spring, 2,encompassing the plunger and extending from'the said shoulder up to theupper bearing-bar, a, of the spindles, serves to press or hold theplunger down in engagement with the pattern-bar while the carriage isdescending and the boring of the other bars is being effected. I

The carriage M has mechanism for moving it upward and downward,suchmechanism consisting,in part,of a T-lever, N, connected with thecarriage by a link or toggle, b, and with the top of the frame A byanother such toggle or link, 0, and also with a stationary post, (1',by-a third link, 6, all being as represented. Under the carriage M, andextending across the frame. A, is a stationary fiat bar, 0, in

which are guide-holes for the plunger and the shaft, the longer arm ofthe said lever being jointed to the carriage M. While such carriage M isdescending the impeller will be retracted and will pass out ofengagement with the pattern-bar until the inclined stud of the impellermay come over another hole in such bar, in which case the impeller willdrop, so as to cause the stud to pass into the said hole. On thecarriageM being next moved upward, the impeller, by its action on thepattern-bar, will advance it and the two carriages immediately under itthe distance for the plunger to enter the next hole in the pattern-bar,and thereby determine the extent of movement of the several bars forthem to be next bored by the boring-tools of the spindles. As the barsmay be advanced, they will slide between the teeth of the rails Gand H,and being usually more or less curved lengthwise, such bars will be keptby the said toothed rails in their proper relations with the severalboring-tools, as the bars in moving forward between the teeth of therails will cause the sustaining-carriage of such bars to move laterallymore or less as may be required. During each descent of thespindle-carriage, the plunger will pass down into a hole in thepattern-bar and will hold it, and of course the carriage,stationary,

This impeller, at its rear while the boring-tools may be operating onthe other bars, During a rise of the spindlecarriage the pattern andother bars will be moved forward the requisite distance for the boringof the next holes in the bars.

From the above it will be seen how a series of bars, each of which islike the pattern-bar in shape and size, may be simultaneously bored,until each like it shall have within it a like number of holes at likedistances asunder.

- I claim 1. The machine, substantially as described, consisting of thespindle-carriage provided with the plunger and series of boring-toolspindles, and with mechanism for imparting to it (the said carriage)reciprocating vertical movements within the frame of the machine, thestationary pointed plunger and boringtoolsguide-bar, the set of toothedbars, the work-supporting carriage and its sustainingcarriage arrangedin and applied to the frame, as set forth, the movable toothed bar, andthe pattern-bar, having mechanism, as explained, for operating them, asspecified.

2. The combination for operating the spindle-carriage, such combinationconsisting of the T-lever and the three links, two of which are jointedto it and the carriage and its supporting-frame, while the third of saidlinks is jointed to the said lever and to a stationary post, all beingsubstantially as represented.

EDWIN LASELLE MANSFIELD.

Witnesses:

R. H. EDDY, R. B. TORREY.

